Cool! Thanks to all of you (Stephane, David, Sandro) for all this
material. The approach was covered pretty poorly in my issue-57
writeup, will amend.
The idea has come up with some favorable reception in a couple of TAG
discussions, so it's useful to have both the pro and con.
Still not sure exactly what the Facebook connection is, but that
doesn't matter too much I guess.
Best
Jonathan